Introduction to the Human Cardiovascular System. Dr. Rakesh Kumar Verma Assistant Professor Department of Anatomy KGMU UP Lucknow
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1 Introduction to the Human Cardiovascular System Dr. Rakesh Kumar Verma Assistant Professor Department of Anatomy KGMU UP Lucknow
2 INTRODUCTION The cardiovascular system is transport system of body It comprises blood, heart and blood vessels. The system supplies nutrients to and remove waste products from various tissue of body. The conveying media is liquid in form of blood which flows in close tubular system. Figure 1-2(f)
3 FUNCTION OF CARDIOVASCULAR SYSTEM Transportnutrients,hormones Removewasteproducts Gaseousexchange Immunity Bloodvesselstransportblood Carries oxygen and carbon dioxide Also carries nutrients and wastes Heartpumpsbloodthroughbloodvessels
4 COMPONENTS OF CARDIOVASCULAR SYSTEM BLOOD HEART BLOOD VESSELS
5 BLOOD The Blood: Blood cells & Plasma Blood cells 1- Erythrocytes - Red Blood Cells 2- Leucocytes 3- Thrombocytes Plasma is fluid portion
6 HEART Heart is a four chambered, hollow muscular organ approximately the size ofyourfist Location: Superior surface of diaphragm Leftofthemidline Anterior to the vertebral column, posterior to the sternum Chapter 18, Cardiovascular System 6
7 HEART Figure 18.1 Chapter 18, Cardiovascular System 7
8
9 FUNCTIONS OF THE HEART Generating blood pressure Routing blood Heart separates pulmonary and systemic circulations Ensuring one-way blood flow Heart valves ensure one-way flow Regulating blood supply Changes in contraction rate and force match blood delivery to changing metabolic needs
10 BLOOD VESSELS Blood Vessels -A closed network of tubes These includes: Arteries Capillaries Veins
11 BLOOD VESSELS -Arteries(Distributing channel) Thick walled tubes Elastic Fibers Circular Smooth Muscle Capillaries (microscopic vessels) One cell thick Serves the Respiratory System Veins (draining channel)
12 BLOOD VESSELS General structure 1.Tunica intima 2.Tunica media 3.Tunica adventitia
13 CLASSIFICATION OF BLOOD VESSELS Conducting Vessels Distributing Vessels Resistance Vessels Exchange Vessels Capacitance/ Reservoir Vessels
14 ARTERIES Blood vessels that carry blood away from the heart are called arteries. They are the thickest blood vessels and they carry blood high in oxygen known as oxygenated blood (oxygen rich blood).
15 ARTERIES Accompanied by vein and nerves Lumen is small No valves Repeated branching
16 CLASSIFICATION OF ARTEIES Elastic- e.g. (Aorta & its Major branches) Muscular -e.g.(renal, Testicular, Radial, Tibial etc.) Arterioles (<0.1 mm)- Terminal arterioles Meta-arterioles Thoroughfare channel/ preferred
17 CAPILLARIES (5-8 micron) The smallest blood vessels are capillaries and they connect the arteries and veins. This is where the exchange of nutrients and gases occurs.
18 BODY CONTAINS TWO KINDS OF CAPILLARIES CONTINUOUS-SKIN, LUNG, SMMOTH MUSCLE, CONNECTIVE TISSUES FENESTRATED-PANCREAS,ENDOCRINE GLANDS, SMALL INTESTINE,CHOROID PLEXUS,CILLIARY PROCESS etc.
19 SINUSOIDS SINUSOIDS- Large irregular vascular space (30-40 micron) eg.liver, Spleen, Bone marrow, suprarenal, Parathyroid etc.
20 VEINS Blood vessels that carry blood back to the heart are called veins. They have one-way valves which prevent blood from flowing backwards. They carry blood that is high in carbon dioxide known as deoxygenated blood (oxygen poor blood).
21 VEINS Thin Walled Large irregular lumen Have valves Dead space around Types: Large Medium Small
22 VEINS Veins without valves: SVC & IVC Hepatic, Renal Uterine, Ovarian not Testicular Facial Pulmonary Umbilical Emissary Portal Veins <2mm
23 VEINS Veins without Muscular tissue: Dural venous sinuses Pial Veins Retinal Veins of erectile tissue of sex organs Veins of spongy bones
24 VEINS Factors responsible for venous return: 1.Muscle contraction 2.Negative intrathoracic pressure 3.Pulsation of arteries 4. Gravity 5. Valves
25 ANASTOMOSIS Communication between vessels ARTERIAL: Actual( end to end & convergent)-palmar, plantar, Circle of Willis, Labial Intestinal arcade, etc. Potential-Coronary, around joints etc.
26 ANASTOMOSIS ARTERIOVENOUS ANASTOMOSIS: 1.Skin of nose 2. Lips 3. External Ear 4. Mucus membrane of GI & nose 5. Erectile tissue of sex organ 6. Thyroid 7. Tongue
27 END ARTERIES END ARTERIES: 1.Central artery of retina 2. Arteries of spleen, liver, kidneys, metaphyses of long bones 3. Central branches of cerebral cortex
28 CIRCULATION Coronary circulation the circulation ofbloodwithintheheart. Pulmonary circulation the flow of bloodbetweentheheartandlungs. Systemic circulation the flow of bloodbetweentheheartandthecells ofthebody. FetalCirculation
29 SYSTEMIC AND PULMONARY Pulmonary circulation The flow of blood between the heart and lungs. Systemic circulation The flow of blood between the heart and the cells of the body. CIRCULATION Figure 18.5 Chapter 18, Cardiovascular System 29
30 CORONARY CIRCULATION: ARTERIAL SUPPLY Chapter 18, Cardiovascular System 30 Figure 18.7a
31 PORTAL CIRCULATION Portal circulation - the flow of blood between tow set of capillaries before draining in systemic veins.
32 FETAL CIRCULATION
33 PLACENTA UMBILICAL ARTERY DESCENDING AORTA (Through Ductus Arteriosus) PULMONARY TRUNK RIGHT VENTRICLE ASCENDING AORTA UMBILICAL VEIN PORTAL VEIN (Through Ductus Venosus) INFERIOR VENA CAVA RIFHT ATRIUM (Through Foramen Ovale) LEFT ATRIUM
34 APPLIED Diseases and Disorders BLOOD PRESSURE HAEMORRHAGE/STROKE ARTERIOSCLEROSIS ANEURYSM CORONARY ARTERY DISEASE (CAD) HEART ATTACK CONGESTIVE HEART FAILURE (CHF) ANEMIA, HEMOPHILIA, AND LEUKEMIA
35 APPLIED Problems with the cardiovascular system are common, but they don t just affect older people. Many heart problems affect children and teenagers.
36
37 QUESTIONS 1-All of the following are the example of elastic arteries except: a)aorta b)common carotid artery c)subclavian artery d)radial artery
38 QUESTIONS 2-All of the following are the example of end arteries except: a)central branches of cerebral arteries b)central artery of retina c)facial artery d)splenic artery
39 QUESTIONS 3-Arteriovenous anastomosis are found at all of the following sites except: a)skin of lips b)erectile tissue of penis c)thyroid gland d)liver
40 QUESTIONS 4-All of the following are the example of portal circulation except: a)hepatic circulation b)renal circulation c)circulation of hypophysis cerebri d)pulmonary circulation
41 QUESTIONS 5-All of the following are features of veins except: a)thin walls b)thin tunica media c)thin tunica adventia d)wide lumen
42 REFERENCES 1- General Anatomy by Vishram Singh 2- Clinical Anatomy by R. Snell 3-Gray s Anatomy
2. capillaries - allow exchange of materials between blood and tissue fluid
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